package com.dyl.gateway;


import cn.hutool.core.util.StrUtil;
import lombok.Data;
import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;

import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

/**
 * 类名：
 * 作者：dyl
 * 功能：自定义断言工厂
 */
@Component
public class AgeRoutePredicateFactory extends AbstractRoutePredicateFactory<AgeRoutePredicateFactory.Config> {

	public AgeRoutePredicateFactory() {
		super(Config.class);
	}
	//1. 进行断言条件判断比较
	@Override
	public Predicate<ServerWebExchange> apply(Config config) {
		return exchange -> {
			//1.1 得到当前的请求对象
			ServerHttpRequest request = exchange.getRequest();
			//1.2 得到参数的值
			String ageStr = request.getQueryParams().getFirst("age");
			//1.3 转换年龄
			if(StrUtil.isNotBlank(ageStr)){
				int age = Integer.parseInt(ageStr);
				return age >= config.getMinAge() && age <= config.getMaxAge();
			}
			return false;
		};
	}

	//2. 定义参数的名字的顺序
	@Override
	public List<String> shortcutFieldOrder() {
		return Arrays.asList("minAge","maxAge");        // age: 10,20
	}
	//3. 定义参数的名字，并且设置对应的setter与getter方法
	@Data
	public static class Config {
		private int minAge;
		private int maxAge;
	}
}
